Circular stitching guide for sewing machines



March 23, 1937. F. RICHARDSON CIRCULAR STITCHING GUIDE FOR SEWING MACHINES Filed Sept. 16, 1955 2 Shets-Sheet 1 March 23, 1937. F RI HA D 2,074,760

CIRCULAR STITCHING GUIDE FOR SEWING MACHINES.

Filed Sept. 16, 1935 ZSheets-Sheet 2 Patented Mar. 23, 1937 UNITED STATES FATENT OFFICE CIRCULAR STITCHING GUIDE FOR SEWING MACHINES 2 Claims.

primary object the provision of an attachment by which a circular row of stitches may be accurately produced in materials joined together by such stitching.

It is another object of the present invention to provide a guide attachment for sewing machines particularly adapted for eifecting the stitching 0 of circular disks of bumng or abrading materials used in shoe manufacture.

For a further understanding of the invention, reference is to be had to the following description and the accompanying drawings, wherein:

Fig. 1 is a perspective view of a sewing machine provided with the circular stitching guide attachment comprising the present invention;

Fig. 2 is a top plan View of the attachment;

Fig. 3 is a vertical sectional view on the plane indicated by the line III-III of Fig. 2;

Fig. 4 is a vertical sectional view on the plane disclosed by the line IV-IV of Fig. 3;

Fig. 5 is a side elevation of the attachment disclosing more particularly the thread cutting means;

Fig. 6 is a detail sectional view on the line VIVI of Fig. 5;

Fig. 7 is a perspective view of a circular abrading 'disk used in shoe finishing operations stitched in accordance with the present invention;

Fig. 8 is a plan view of the disk disclosing the circular row of stitching therein.

Referring more particularly to the drawings, the numeral I designates the standard sewing machine, the same being provided with the usual frame 2, a vertically reciprocable needle holder 3, a presser bar 4, a bed 5 and a work advancing foot or linearly movable feed dog 6. All of these parts are of the usual construction and operation,

and therefore a more extended explanation thereof may be omitted.

Arranged to be mounted on the upper surface of the bed 5 is the guide attachment 1 comprising the present invention. In its preferred form,

this guide attachment includes a metallic ring 8 from which project apertured ears 9 by which the attachment is secured to the machine bed. One side of the ring 8 is relieved or recessed as at [0 to receive the needle carried by the holder 3 and the work advancing foot 6.

In use, circularly cut pieces of material, as indicated at H in Fig. '7, are placed on the upper surface of the bed 5 within the confines of the ring 8, so that the peripheral edge of such material will be arranged over the foot 6 and in registration with the needle carried by the holder 3. The material is held fiat while the stitching operation is going on and prevented from bunching by use of a circular plate l2 which is inserted within the ring 8, as shown in Figs. 2 and 3. 5 The work or material is maintained in a flat condition and prevented from flexing.

The plate 12 carries a bar I 3 which is shouldered as at M to rest upon the upper edge of the ring 8, and passing through the bar l3 and held 10 thereby is a transverse pin l5, the ends of which are adapted to be received within notches l6 formed in connection with the opposite sides and the upper edges of the ring 8. This construction serves to positively position the presser plate on 15 the work and to prevent its rotation or partial rotation during the operation of stitching. As shown in Fig. 2, the plate I2 has its forward edge relieved or recessed as at I! for the accommodation of the sewing machine needle and the work advancing foot 6.

The bar 4 carries at its lower end a wheel l8 which is employed to impart pressure to a limited area of the circumferential edge of the work to be stitched, so that such work will be maintained in positive contact and advancing relationship with the foot 6. It will be understood that during the operation of the sewing machine, the foot 6 operates as usual to impart movement to the work, and in this instance the movement is of a rotary type.

Adjacent to the frame 2 of the machine, and to one side of the presser bar 4, there is arranged on the bed 5 a thread cutter [9. In this instance, the cutter comprises a sheet metal plate having a knife edge 20 and an oppositely disposed dulled edge 2|. Cooperative with' the edge 2! is a resilient guide wire 22, also carried by the bed 5 of the machine. Following a given stitching operation, the operator of the machine passes the thread which remains between the needle and the work stitched between the guide wire 22 and the edge 2| of the cutter, and then by moving the thread along the knife edge 20, its severance takes place.

While the mechanism comprising the present invention may be employed in any circular stitching operation, nevertheless it is particularly adaptable for service in the stitching of emery cloth disks, as indicated at I l in Figs. 7 and 8. 50 These disks are employed in bufiing and dressing operations and comprise a circularly abrasive containing layer 23 and a top outer or securing layer 2t. Such a disk is adapted to be placed on the rotary buffing head, not shown, of a buf- 55 fing or abrading machine. It is important in securing such a disk to the head of the machine that the circular stitching 25 in the perimeter thereof should be accurate and as far as possible 5 truly circular. By the present invention, the securing together of the layers 23 and 24 of such a disk may be readily accomplished in an expeditious and accurate manner so that such disks may more efficiently perform the service for which they are adapted.

What is claimed is: 1. In a sewing machine, the combination with a stationary work support, a linearly movable work advancing dog and a pressure bar, of a stationary work-receiving guide mounted on the work support for receiving circular multi-ply materials to be circumferentially stitched, said guide being circumferentially slotted in registration with the work advancing dog, a roller carried by the lower end of the pressure bar for engagement with the peripheral edge of the material to be stitched where such material projects through the slot in said guide, said roller holding the edge of said material in engagement with the 25,work advancing dog, a pressure plate movably mounted in said guide independently of the pressure bar and roller, said plate being disposed to cover the material received in said guide to maintain the material in a fiat unwrinkled condition while said material is being rotated about a fixed center, and devices carried by said plate and cooperative with said guide to preclude rotation on the part of said plate when operatively positioned in said guide, said devices furnishing finger receiving portions to facilitate manipulation of said plate in and out of said guide.

2. In a sewing machine, the combination with a stationary work support, a linearly movable work advancing dog and a pressure bar, of a stationary work receiving guide mounted on the work support, said guide being provided with an upstanding circular flange, the latter being slotted to permit circular disks of multi-ply fabric positioned in said guide to directly engage with the work advancing dog and said pressure bar, a removable disk insertable in said guide to maintain fabric disks positioned therein in a flat unwrinkled condition while said disks are being rotated about the center of the guide, said plate being provided with a peripheral recess in registration with the slots provided in the flange of said guide, and means carried by said plate and cooperative with the flange of said guide to preclude rotation on the part of said plate when operatively positioned in said guide.

FRED RICHARDSON. 

